Boots are just for protection, you can tear a boot on a root or something similar the first time you ride it. The way to tell wear in a way is to jack up the front and grasp the tire by top and bottom to check play up and down, then grasp tires at the right side and left side and move by and forth slowly to check for wear there. When moving the tire it should have very little movement at the tire and the ball joint.
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